Roseanne Barr says she is leaving Twitter after apologizing for calling Valerie Jarrett, a former adviser to President Barack Obama, an offspring of the "Muslim Brotherhood & Planet of the Apes."
Barr apologized then vowed to leave Twitter. About five minutes later she expanded on her apology. “I apologize to Valerie Jarrett and to all Americans,” Barr tweeted. “I am truly sorry for making a bad joke about her politics and her looks. I should have known better. Forgive…